Gas clamp fob oil-well casings



2 Sheets-Sheet .-1

% INVENTOR 2% 5g. BY

w/ rfiM/t ATTORNEYS.

W CANFIELD GAS CLAMP FOR,OIL WELL CASINGS Ongmal Flled April 12, 1922 March 10, 1 925.

March 10, 1925.

W. CANFIELD GAS CLAMP FOR OIL WELL CASINGS Original Filed April 12, 1922 2 sheets-sheet 2 T a o 7.,

I I21 Y1 12 5 .11. I 11. 7f I 12. I 1x 13 13. '1 i ATTO'RNEY- A Reiss es M... 10,- 19z5.- v iuu raofsmras Re .l6 ,018 PATENT OFFICE.

wamcn cmmnn, orrar'r, canrronm ens Fo'n bin-WELL casinos Original No. 1,448,285, dated Iarch 18,1923, Serial No. 551,829,111 April 12, 1928 Application for reissue fled September 9, 1824. Serial No. 138,774.

To all wh om may Be it known that 'I, WALLACE CANFmLn,

a citizen of the United States, residing at.

Taft, in thecounty of Kern and State of I California, have inventedcertain newand 1 useful Improvements .in Gas Clamps for Oil-Well Casings, of which the following is aspecification. 7 My invention relates tothe well-drilling art and particularly to devices and appli;

ances usually termed gas-clamps,'the purpose of which is-to shut off thespace between the outer or anchored string of casing and the inner or Working string ofcas- 16 ing.

n drilling oil wells in certain localities where flowing wells are expected, it is desir-' able to'provide against a blow-out'from the space between the two casing strings, this 0 ject being attained bythe so-called gasthe urpose. t

- e object'of my inventionis' to provide 1 a device or appliance of this class-,which is 12 dependable, 1s easy to adjust, and is eifectivefl s To this end, myinvention consists in thewhich I shall hereinafter novel gas-clam fullyi describe y reference'to the accom- 0 panying drawings, in which Fig. 1 is a top-plan view of my gas-clamp, show'm'git in the form of hinged sections opened out in extended position.

Fig. 2 is an elevation of the same look at it from the'inside. 'ig. 3 is an elevation of he bolt receiving extremity of one of the clamp members, showing the fitting of the bolt thereto. Figs. 4 and 5 are .views of the varcuate sections of the packing to befitted'in the upper and lower groove seats of the clamp- 1. members.

Fig. 6 is a top lan view of clamp showing itc osed. Fig. 7 is a vertical sectional view, partly as n I in elevation, of my clamp showing it ap-- plied to the inside and outside casings 1 j close the spacebetweecn them.-

, "1 and 2' are-symmetrical, complementah 5 clamp-members,- with arcuate faces substan tially semicircular in extent. These clampmembers are adapted to'embrace-the inner casing and to be secured and held thereon 'in any suitable manner. In the formjhere vertically slotte clamps which, by closing said space, serve my hinged shown they are hingggd to ether and looked as I shall now 'dGSCII e. I

Each member is formed with end extenslons, those desi nated by 1 and 2 being and 2f of the members 1 and 2, respectively,

to receive between them the hinge-link 3 to which they are pivotedby the rivets 4. In the other extensions 1" are made locking seats 5 and 6. The seat 5 is T-shaped to receive the T-head 7 of the locking bolt 7, one side of the seat being left open as shown'at 5' in Fig. 3,-to permlt the bolt head to be readily fitted to place. The

other seat 6 is a plain groove to receive the bolt shank. I

7 is a nut on the bolt. It will now be" seen, by reference to Fig. 6, that the clamp members may be turned about their hinge link 3 to a closed position, and secured by the locking bolt 7 and its'nut' 7 in which is seated a section of packing 11,

v In the upper edge of the arcuate face of each clamp-member is made a groove said groove being so shaped as to form a base equal. in width to" and fully supporting the packing, as seen in Figs. 2 an 7 ,and

a relatively narrower top to permit ;the partial exposure of the upper surface-of the packin In the lower surface ofeach clamp-mem er, exterior. to and concentric with its face, is made a groove in which is seateda section of packing 12,- the lower surface of which is exposed as seen in Figs.

2 and 7. Each clamp-member, between the inner side of the packing 12an(l its 'arcuate face is tapered downwardly to form a guide portion 13. i I Y In he clamp memberl on its inner surface at each side of its arcuate face is made a socket .to seat a block of packings 14, the surface of-said block projecting slightly from the seat as seen in Figs. 1 and 6, its

upper inner edge forming ajoint against the packing 11 and its lower outer edge joining the acking12, as seen in Fig. 2.

In; Fig. to which reference is now made, the application of my. gas-clamp to the well casings will be seen. Sis the string 10 is the outer or'anchored casi with a collar10'.

of inner 'or working casing, and; 8' is a collar connecting two-lengthsof s 'd string.

working string of casing is then set down in the outer casing 10. The tapered guide portion 13 will bring the bottom packing l2 accurately into contact with'the collar 10' of saidiouter casing, and will also serve to hold the clamp together until the lock-.

ing nut 7 is set up, thus effectively shutting oil' the space between the two casings.

Due to the fact that all the packingsare well supported on all sides when in use, they may be used a number of times and not renewed each time the clamp is used, as with ordinary gas clamps. The gas clamps in common use comprise two halves bolted together at each end with gaskets between them and with a groove in the bottom to fit thecollar of the outer casing;

a ring of packing being inserted after the gas clamp is in place. The bottoms of these clamps are flat and the packing must be guided on top of the lower collar which is sometimes very difiicult when the working string of casing is heavy and hangs slightly out of line.

of easing under a collar and set in a on top of the clamp. I

To put on and ad'ust a gas clamp of this kind, that is, place t e gaskets and packing, bolt together and guide into place, takes considerable time often as much as thirty minutes; When an'actual blow out occurs it is often impossible to place this type of groove gas clamp on account of the gas and oil coming from between the strings of easing interfering so greatly with the work. At such times the working string of pipe may be frozen up or the well actually lost. But my gas clamp can be placed on the working string of casing in a few seconds,'even when considerable gas and oil arecoming from between the two strings and when set down the packing and gaskets are automatically drawn, into place and the space between the two strings of easing effectively sealed. The clamp is thus eas to adjust and is effective and dependab e. I claim: 1 1

1. A gas-clamp for well-casing, comprising a pair of complemental clamp-members adapted to embrace the inner casing; a hinge connection between said clamp-members adapting them to be fitted to said cas- The packing at the top is wrapped around the working string ing; a locking member to'hold them on the casing; and packing members carried by .said clamp members and adapted to bear on a collar of the inner casing and 011 a collar of the outer casing, respectively, to

close the space between saidcasings.

2. A gas-clamp :t'or well-casing, comprising a pair of complemental clamp-members adapted to embrace the inner casing; a hinge connection betweensaid clamp-members adapting them to be fitted to said casthe casing; packing members carried by said clamp members and adapted to bear on a collar of the inner casing and on a collar of the outer casing, respectively, to close a locking member to hold them on the space between said casings; and other packing members forming joints with said rirst named packing members to seal the space between the clamp-members.

3. A gas-clamp for well-casings comprising a pair of complemental clamp-members adapted to' embrace the inner casing; a hinge connection between said clamp-mere bers adapting them to be fitted to said casing; a lock 'bolt pivotally mounted in the free extremity of one of said clamp-members and adapted to engage the tree extremity of the other of said clamp-members; a nut on said bolt to set it in locked position; and packing members carried by said clamp-members and adapted to bear on a collar of the inner casing and on a collar of the outer casing respectively, to close the space between said casings.

4. A gas-clamp for well-casings compris-- ing a pair of comolemental clamp members adapted to embrace the inner casing; a hinge connection between said clamp-members adaptingthem to be fitted to said cas' ing; a lock bolt pivotally mounted in the free extremity of one of said clamp-membersand adapted to engage the free ex t-remlty of the other of said clamp-members; a nut on said bolt to set it in locking position; packing members carried by said clamp-members and adapted to bear on a collar of the'inner casing and on a collar of the outer casing respectively, to close the space between said casings; and other packing members forming joints with said first named packing members to seal the space between the clamp members.

ing a pair of complemental clamp-members adapted to embrace the inner casing; a,

hinge, connection between said clamp-mcm bers adapting them to be fitted to said casing; a locking member to hold them on the casing; a packing member seated in the 5. A gas-clamp for well-casings comprisupper edge of theclamping face of each clamp-member and adapted to bear ona collar of the inner casing; and-a packin member seated in the under side of eac clamp-member and adapted to bear on a collar of the outer casing, whereby the space between said casings is closed.

'6. A gas-clamp for well-casings comprising a pair of complemental clamp-memybers adapted to embrace the inner casing;'

the casing; a packing member seated in the upper edge of the clamping face of each clamp-member and adapted to bear .on a

collar of the inner casing; apacking member seated in the under side of'each clampmember and adapted to bear on a collar of the outerv casing, whereby the space between said casings is closed; and other packing members seated in the inner face of one 'of said clamp-members between and forming oomplementa clamp-members adapted ing joints with said first-named packing members, to seal the space between the clamp-members.

7. A gas-clamp for well-casings comprising a pair of complemental clamp-members adapted-to embrace the .inner casing; ahinge connection between said clamp-members adapting them to be fitted to said casing; a lock bolt pivotally'mounted in the free extremity of one of said clamp members and adapted to engage the free extremity of the other of said clamp-members; a nut on said.

bolt to set it in locked position; a packin member seated in the upper edge of the clamping face of each clam -member and adapted to bear on a collar 0 the inner casing; a packing member seated in the under side of each clamp-member and adapted to bear on a collar of the outer casing, whereby the space between said casings is closed; and other packing members seated in the inner face of one of said clamp-members between .and forming joints with said first named packing members, to seal the space between the clamp-members.

8. A gas-clamp for well-casings comprising a pair of complemental clamp-members adapted to embrace the inner casing, said members having downwardly tapered lower portions adapted to guide them into-the outer casing? a hinge connection between said clamp-members adapting them to be fitted to said casing; a locking member to hold them on the casing; and packing mem bers carried by said clamp members and adapted to bear on a collar of the inner easing and on a collar of the outer casing, re-

spectively, to close the space between said caslngs.

- membershaving downwardly tapered lower portions adapted to guide them into the outer casing; a hinge connection between said clamp-members adapting them to be fitted to said casing; a lock bolt pivotally memb mounted in the free extremit clamp-members andgadapted to en age the free extremity of the other of sai clampmembers; a nut on said bolt to set it in locked position; a packing member seated in-the upper edge of the clamping face of each clamp-member and adapted to bear. on-

a collar of the inner casing; a packing member seated in the underside of each clampmember and adapted to bear on a collar of the outer casing, whereby the space between said casings: is closed; and other acking members seated in the inner face of one of vsaid clamp-members between and forming joints with said first nained packing members, to seal the space between the clampers.

10; Agas-clam for well-casings compris of one of said 11. A gas-clamp for well-casings comprising complemental clamp-members adapted to embrace an inner casing; means for holding them on said casing; a packing member seated in the clamping face of said clamp members, adapted to bear on a collar of the inner. casing; a packing member seated in the under side of said clamp-members, adapted to bear upon a collar of an outer casing, to close the space between said casings; and other acklng members seated in said clamp-mem is between and orming joints with said first named packing members, to seal the space betweenthe clampmembers. 7

12. A gas-clam for well-casingscomprising complementa clampmembers adaptedto embrace an inner casing, said members having downwardly tapered lower portions adapted to guide them into an outer casing; means for holding said clamp-members upon the inner casin and packing mem: bers carried by 'said 0 amp-members, adapted to bear on a collar of the inner casing and on a collar of the outer casing, respectively, to close the space between said casings.

13. A gas-clamp for well-casings comprising complemental clamp-members ada ted to embrace an inner casing, said mem ers seated in the clamping face of sald clamp members, adapted to bear on a collar of the inner casing a packing member seated in the under side of said clam -members,

adapted to bear upon a collar 0 the outer casing to close the s ace between said casings; and other packing'members seated in said clamp-members between. and forming joints withsaid first named packing members, to seal the space betweenthe clampmembers. 1

I11 testimony whereof I have signed my name to this specification.

WALLACE CANFI'ELD. 

